Counterbalancing Needed to Avoid Bias in Side-By-Side Brightness Matching Tasks

摘要: AbstractSpectral power distribution (SPD) is one of the variables that can be manipulated in lighting design. This article examines twenty previous studies which have investigated effect SPD on brightness using side-by-side matching technique. Three sources experimental bias are identified and shown to present majority these studies, hence must considered provide an unreliable estimate magnitude brightness. The first associated with test participants' use dimming control two forms apparent – a response contraction when repeated at multiple reference illuminances conservative carried out single illuminance. second primary direction take place third relative position stimuli within apparatus.